Spark intensifying device



q 5 of an electrical resistance.

specification at the name Dee. 4,1934 I imam SPARK INTENSIFYING DEVICE James D. Curtis, Collingawood, N. 1. "higher, by

entl, to Helen Camden, N. J.

Ban-Curtis Applimthm January 23, 1933, Serial No. 653,000 6 Claim. (Cl. 128-169) The subject of my invention is a spark plug for use with internal combustion engines containing a spark intensifying device. The spark intensifying device contains as an element there- 'Ihe spark intensitying device also contains a condenser or vibrating spark gap.

For a further exposition of my invention reference may be had to the annexed drawing and end whereof my invention will be specifically pointed out and claimed.

In the drawing,

Figure A is a side elevation of my device.

Fig. B is a longitudinal cross section through u the device.

Fig. C is a transverse cross section on line C-C of Fig. A.

cross section through the spark intensifying device, at right angles to Fig;

Fig. E is a partial, vertical cross section through the spark intensifying device.

a In that embodiment of my invention, chosen for illustration in the drawing, my device is shown as consisting of a terminal nut 1. Nut 1 is attached to top stud 2 as by'screw threads. Insulator 3 which forms the body of the spark plug carries top stud 2 as by screw threaded engagement therewith.

Located within a chamber in the spark plug and in insulator 3 there is shown the spark intensifying device. This consists of upper and lower caps 4 which may conveniently be made of brass or other metal. Adjacent or in contact with the upper cap 4 there is provided an electrical resistance 5 carried by the condenser body 6 which. is conveniently made of insulating material. Also mounted in condenser bo'dy6 is condenser roller 8 which may conveniently be loosely mounted in body 6 adjacent one end of resistance 5 and in contact with or adjacent cap 4. Resistance 5 has a resistance of more than 1000 ohms, a preferred example of such resistance being 50,000 ohms.

.45 As will be more clearly seen from Figs. B, D

and E, resistance 5 may be mounted in condenser body 6, so that there is a space or clearance between these elements. Likewise, condenser roller 8 has a slight space at its upper side between it and the holes in condenser body 8, in which roller 8 is located. Condenser body 6 extends below the ends of roller 8 since condenser body 6 has holes therein the lower parts of whose walls are shown in cross-section in ,Fig. E. .Roller- 22 245 also has a slight space at its ends between it and.

cap 4. It will thus be seen that roller 8 is separated from cap 4 by portions of condenser body 6 and by air gaps, these serving as the dielectric of a condenser. When current of sufiicient insparks may pass between the ends of roller 8 and cap 4, and between the center of roller 8 and the center of cap 4.

Gland nut 7 surrounds insulator 3 having encap 4 there is provided a condenser spring 9 that the baflle 16servesto prevent or check the rush of gases into the chamber within shell 12 and thus prevents cracking or breaking of the insulator or porcelain 3. Shell 12 carries at its lower end ground wire 17 which has a portion of considerable length 17 from causing oscillations of the entire ignition system and thus interfering with a radio on the vehicle with which the internal combustion engine is used.

The condenser roller 8 serves'to build up a high tension current before the discharge passes between electrode wire 15 and ground wire 1'7. Thus a larger and surer spark is obtained.

I do not intend to be limited in the practice of my invention save as the scope of the prior art and of the attached claims may require.

I claim:

1. In a spark plug, a spark intensifying device comprising an insulating body, a resistance of more than 1000 ohms mounted in said body, a metallic roller mounted in said body adjacent said resistance, and means for conducting current to said resistance and to said roller.

2. In a spark plug, a spark intensifying device comprising an insulating body, a resistance of more than 1000 ohms mounted in said body, a

metallic roller loosely mounted in said body ador said spark plug, second means in said bodv (or jacent to but spaced from said resistance, and increasing the intensity of the current passing metallic caps on the ends 01 said body for conthrough said plug, and third means for conductducting current to said resistance and to said ing current to said first and second means. roller. Y 5. In a spark plus, a spark intensifying device 80 3. In a spark plug, a spark intensifying device comprising an insulating body, a resistance 0! comprising an insulating body, a resistance 0! more than 1000 ohms mounted in said body, a more than 1000 ohms mounted in said body, a condenser mounted in said body, and means for metallic roller mounted in said body adjacent to conducting current to said resistance and said said resistance, and metallic caps on the ends of condenser; said body for conducting current to said resist- 6. In a spark plug having a spark gap, a device ance and to said roller, said roller being adjacent comprising an insulating body, a resistance. of to but spaced from one oi said caps. more than 1000 ohms mounted in said body, a 4. In a spark plug having a spark gap therein, condenser located between said resistance and a spark intensifying device comprising an insaid gap, and means for conducting electricityto 90 sulating body, means for suppressing the oscilsaid resistance and said condenser. lations generated by the spark passing at the sap 7 JAMES D. CURTIS. 

